XML 56 R36.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Retirement Plans And Other Postretirement Benefits (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Retirement Benefits [Abstract] |
Reconciliation Of Changes In Benefit Obligations And Plan Assets | The following tables reconcile the changes in benefit obligations and plan assets in 2023 and 2022, and reconcile the funded status to prepaid or accrued cost at December 31, 2023 and 2022:
| Pension Benefits |  |  | Other Post- Retirement Benefits
(In thousands) | 2023 |  | 2022 |  |  | 2023 |  | 2022
Change in benefit obligation: |  |  |  |  |  |  |  |
Benefit obligation, beginning of year | $ | 248,114 |  |  | $ | 316,169 |  |  |  | $ | 5,726 |  |  | $ | 7,370 |
Service cost | — |  |  | — |  |  |  | 10 |  |  | 18 |
Interest cost | 9,623 |  |  | 8,945 |  |  |  | 288 |  |  | 207 |
Effect of actuarial (gains) losses related to the following: |  |  |  |  |  |  |  |
Discount rate change | (10,751) |  |  | (61,519) |  |  |  | 99 |  |  | (1,483) |
Other | (6,459) |  |  | 1,513 |  |  |  | 12 |  |  | 90 |
Plan participant contributions | — |  |  | — |  |  |  | 490 |  |  | 554 |
Benefits paid | (16,957) |  |  | (16,994) |  |  |  | (913) |  |  | (1,030) |
Settlement payments and annuity purchase | (221,970) |  |  | — |  |  |  | — |  |  | — |
Benefit obligation, end of year | $ | 1,600 |  |  | $ | 248,114 |  |  |  | $ | 5,712 |  |  | $ | 5,726 |
Change in plan assets: |  |  |  |  |  |  |  |
Plan assets at fair value, beginning of year | $ | 218,119 |  |  | $ | 244,612 |  |  |  | $ | — |  |  | $ | — |
Actual return on plan assets | (7,053) |  |  | (59,683) |  |  |  | — |  |  | — |
Employer contributions | 27,861 |  |  | 50,184 |  |  |  | 423 |  |  | 476 |
Plan participant contributions | — |  |  | — |  |  |  | 490 |  |  | 554 |
Benefits paid | (16,957) |  |  | (16,994) |  |  |  | (913) |  |  | (1,030) |
Settlement payments and annuity purchase | (221,970) |  |  | — |  |  |  | — |  |  | — |
Plan assets at fair value, end of year | $ | — |  |  | $ | 218,119 |  |  |  | $ | — |  |  | $ | — |
Funded status of the plans | $ | (1,600) |  |  | $ | (29,995) |  |  |  | $ | (5,712) |  |  | $ | (5,726) |
Amounts recognized in the consolidated balance sheets: |  |  |  |  |  |  |  |
Accrued expenses (current) | $ | 180 |  |  | $ | 180 |  |  |  | $ | 489 |  |  | $ | 489 |
Pension and other postretirement benefit obligations, net | 1,420 |  |  | 29,815 |  |  |  | 5,223 |  |  | 5,237 |
Net amount recognized | $ | 1,600 |  |  | $ | 29,995 |  |  |  | $ | 5,712 |  |  | $ | 5,726 |
Components Of Net Periodic Benefit Income Or Cost For Continuing Operations | The following table sets forth the assumptions used in accounting for the pension and other post-retirement benefits, and the components of net periodic benefit cost:
| Pension Benefits |  |  | Other Post- Retirement Benefits
(In thousands, except percentages) | 2023 |  | 2022 |  | 2021 |  |  | 2023 |  | 2022 |  | 2021
Weighted-average assumptions used to determine benefit obligations: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 4.89 | % |  | 5.07 | % |  | 2.90 | % |  |  | 4.98 | % |  | 5.17 | % |  | 2.86 | %
Expected long-term return on plan assets | n/a |  | 4.99 | % |  | 3.05 | % |  |  | n/a |  | n/a |  | n/a
Weighted-average assumptions used to determine net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate(a) | 5.07%/5.37% |  | 2.90 | % |  | 2.57 | % |  |  | 5.17 | % |  | 2.86 | % |  | 2.54 | %
Expected long-term return on plan assets | n/a |  | 3.05 | % |  | 5.00 | % |  |  | n/a |  | n/a |  | n/a
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  |  | $ | 10 |  |  | $ | 18 |  |  | $ | 21 |
Interest cost | 9,623 |  |  | 8,945 |  |  | 8,398 |  |  |  | 288 |  |  | 207 |  |  | 195 |
Expected return on plan assets | (8,109) |  |  | (8,174) |  |  | (11,316) |  |  |  | — |  |  | — |  |  | — |
Amortization of prior service costs and gains or losses | 9,245 |  |  | 13,746 |  |  | 17,003 |  |  |  | (213) |  |  | (140) |  |  | (141) |
Net periodic benefit cost | $ | 10,759 |  |  | $ | 14,517 |  |  | $ | 14,085 |  |  |  | $ | 85 |  |  | $ | 85 |  |  | $ | 75 |
Pension settlement loss | 92,291 |  |  | — |  |  | — |  |  |  | — |  |  | — |  |  | — |
Total benefit cost | $ | 103,050 |  |  | $ | 14,517 |  |  | $ | 14,085 |  |  |  | $ | 85 |  |  | $ | 85 |  |  | $ | 75 |
(a) Prior to the pension lump sum distributions in August 2023, a discount rate of 5.07% was used to determine the net periodic benefit cost. Subsequent to August 2023, a discount rate of 5.37% was used to determine the net periodic benefit cost until the Company purchased a nonparticipating single premium group annuity contract in October 2023.
Schedule Of Expected Benefit Payments For Continuing Operations | Expected benefit payments over the next five years and in the aggregate for 2028—2032 are as follows:
(In thousands) | Pension Benefits |  | Other Post- Retirement Benefits
2024 | $ | 180 |  |  | $ | 481 |
2025 | 172 |  |  | 470 |
2026 | 165 |  |  | 456 |
2027 | 157 |  |  | 445 |
2028 | 148 |  |  | 433 |
2028—2032 | 620 |  |  | 1,998 |
Schedule Of Amounts Recognized Before Related Deferred Income Taxes In Accumulated Other Comprehensive Income | The pre-tax amounts recorded in 2023, 2022 and 2021 in accumulated other comprehensive income (loss) consist of:
| Pension Benefits |  | Other Post-Retirement Benefits
(In thousands) | 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021
Net actuarial (gain) loss | $ | 415 |  |  | $ | 103,998 |  |  | $ | 109,893 |  |  | $ | (1,250) |  |  | $ | (1,574) |  |  | $ | (320) |
Schedule Of Percentage Composition Of Assets Held By Pension Plans | The percentage composition of assets held by the pension plan at December 31, 2022 was as follows:
| % Composition of Plan Assets at December 31,
| 2022
Pension plan: |
Fixed income mutual fund | 13.9 | %
Private equity and hedge funds | 4.8 |
Collective investment trust | 69.9 |
Cash and cash equivalents | 11.4 |
Total | 100.0 | %
Schedule Of Pension Plan Assets Categorized By Level Within Fair Value Measurement Hierarchy | At December 31, 2022, the pension plan assets are categorized by level within the fair value measurement hierarchy as follows:
(In thousands) | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Balances at December 31, 2022 |  |  |  |  |  |  |
Cash and cash equivalents(a) | $ | 24,796 |  |  | $ | 24,796 |  |  | $ | — |  |  | $ | — |
Fixed income mutual fund | 30,284 |  |  | 30,284 |  |  | — |  |  | — |
Private equity and hedge funds(b) | 10,250 |  |  | — |  |  | — |  |  | 10,250 |
Total plan assets at fair value | $ | 65,330 |  |  | $ | 55,080 |  |  | $ | — |  |  | $ | 10,250 |
Investments measured at net asset value: |  |  |  |  |  |  |
Collective investment trust(c) | 152,389 |  |  |  |  |  |  |
Private equity and hedge funds | 141 |  |  |  |  |  |  |
Total investments measured at net asset value | $ | 152,530 |  |  |  |  |  |  |
Securities sold and interest receivable | 259 |  |  |  |  |  |  |
Total plan assets, December 31, 2022 | $ | 218,119 |  |  |  |  |  |  |
(a) This category represents investments in cash and cash equivalents, which includes: 1.) cash held in the plan used for investments in U.S. Treasury futures which were entered into to minimize the volatility of the estimated settlement funding gap; and 2.) short term money market fund in which the amortized cost approximates fair value. These investments were highly liquid and therefore were classified as Level 1 securities. (b) Represents the estimated fair market value of the Company’s ownership in private equity and hedge funds which were probable of being sold for an amount different from the net asset value per share in connection with the expected termination of the pension plan. (c) The collective investment trust contains liability hedging fixed income investments and were valued at the net asset value of the collective investment trust. The net asset value was used as a practical expedient to estimate fair value. The net asset value was based on the fair value of the underlying investments held by the fund less its liabilities. (d) Represents investments in certain commodity funds measured using quoted market prices.

X
- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets as well as the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References No definition available. + Details
Name: | tg_ScheduleOfAssumptionsUsedAndScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | tg_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Percentage Composition Of Assets Held By Pension Plans [Table Text Block] + References No definition available. + Details
Name: | tg_ScheduleOfPercentageCompositionOfAssetsHeldByPensionPlansTableTextBlock
Namespace Prefix: | tg_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (d)(5) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (a) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfChangesInProjectedBenefitObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in plan assets and benefit obligations recognized in other comprehensive income (loss) during the period. + References No definition available. + Details
Name: | us-gaap_ScheduleOfDefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (f) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration